240251721 has 16 divisors (see below), whose sum is σ = 336491520. Its totient is φ = 152182800.

The previous prime is 240251663. The next prime is 240251743. The reversal of 240251721 is 127152042.

It is not a de Polignac number, because 240251721 - 2⁶ = 240251657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 240251691 and 240251700.

It is not an unprimeable number, because it can be changed into a prime (240251761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1111 + ... + 21948.

It is an arithmetic number, because the mean of its divisors is an integer number (21030720).

Almost surely, 2^240251721 is an apocalyptic number.

It is an amenable number.

240251721 is a deficient number, since it is larger than the sum of its proper divisors (96239799).

240251721 is a wasteful number, since it uses less digits than its factorization.

240251721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23236.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 240251721 is about 15500.0555160296. The cubic root of 240251721 is about 621.6636907412.

The spelling of 240251721 in words is "two hundred forty million, two hundred fifty-one thousand, seven hundred twenty-one".